Interfire IFB2340

Price & Contact:$960–$1020; Phone 562-903-0084; Web www.interfireaudio.com.
All measurements @ 14 volts unless otherwise specified:
Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1kHz Ref.}: +0.8 dB, -0.5 dB
L/R channel error max deviation 20 Hz to 20 kHz: 0.2 dB
Phase Response (4-ohm IHF Load 20 Hz to 20 kHz, 1 kHz Ref.): +21.6 degrees, -23 degrees
Signal-to-Noise Ratio (Below Rated Output, "A" weighted): -97.7 dB
Distortion at Rated Output @ 1kHz: 0.5% @ 1100 watts
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N, all channels driven into 4 ohms: 393 watts x 2 @ 14 volts, 325 watts x 2 @ 12.8 volts, 120 watts x 2 @ 10.5 volts
Output Power (resistive) minimum output, 20 Hz to 20 kHz @ 1%THD+N, all channels driven into 2 ohms: 582 watts x 2 @14 volts,
491 watts x 2 @ 12.8 volts, 222 watts x 2 @ 10.5 volts
Output Power (4-ohm IHF Reactive Load @ 60 Hz to 1% THD+N):
1262 watts
Crosstalk (Referenced to Rated Output, 20 Hz to 20 kHz): -46.7 dB
Damping Factor @ 100Hz, 2 ohms: 32
Voltage for Rated Output: 340 mV to 10.9 volts High Range, 2.1 volts to less than 13 volts Low Range
Idle Current Draw: 1 amp
Current Draw @ 1/3 Maximum Power: 85 amps @ 382.7 watts
Efficiency @ 1/3 Maximum Power : 32%
Power-Up Noise: 46.9 dB SPL
Power-Down Noise: 51.6 dB SPL

		Interfire IFB2340 www.interfireaudio.com
		In a competitive market, Interfire’s massive IFB2340 amplifier stands out with a bevy of features and multiple configuration options.		Interfire IFB2340 Specs Price & Contact:$960–$1020; Phone 562-903-0084; Web www.interfireaudio.com. All measurements @ 14 volts unless otherwise specified: Frequency Response (4-ohm IHF Load, 20 Hz to 20 kHz, 1kHz Ref.}: +0.8 dB, -0.5 dB L/R channel error max deviation 20 Hz to 20 kHz: 0.2 dB Phase Response (4-ohm IHF Load 20 Hz to 20 kHz, 1 kHz Ref.): +21.6 degrees, -23 degrees Signal-to-Noise Ratio (Below Rated Output, "A" weighted): -97.7 dB Distortion at Rated Output @ 1kHz: 0.5% @ 1100 watts Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N, all channels driven into 4 ohms: 393 watts x 2 @ 14 volts, 325 watts x 2 @ 12.8 volts, 120 watts x 2 @ 10.5 volts Output Power (resistive) minimum output, 20 Hz to 20 kHz @ 1%THD+N, all channels driven into 2 ohms: 582 watts x 2 @14 volts, 491 watts x 2 @ 12.8 volts, 222 watts x 2 @ 10.5 volts Output Power (4-ohm IHF Reactive Load @ 60 Hz to 1% THD+N): 1262 watts Crosstalk (Referenced to Rated Output, 20 Hz to 20 kHz): -46.7 dB Damping Factor @ 100Hz, 2 ohms: 32 Voltage for Rated Output: 340 mV to 10.9 volts High Range, 2.1 volts to less than 13 volts Low Range Idle Current Draw: 1 amp Current Draw @ 1/3 Maximum Power: 85 amps @ 382.7 watts Efficiency @ 1/3 Maximum Power : 32% Power-Up Noise: 46.9 dB SPL Power-Down Noise: 51.6 dB SPL
		by Brian Smith

		The IFB2340 is a two-channel amplifier with power ratings of 340 watts x 2 or 1100 watts x 1 into 4 ohms, and 680 watts x 2 into 2 ohms. Features include balanced inputs, dual range input sensitivity, subsonic filter, a low pass crossover with variable cutoff frequency, bass boost with variable center frequency, and RCA line level outputs. The amp is available in a sleek black or chrome finish. Performance The IFB2340 performed well during its test session, beating all of its power ratings with exception of the 2-ohm stereo listing. That rating seemed a bit strange from the outset. In most cases, output into a stereo 2-ohm load produces about the same total power as a 4-ohm bridge. Our tests results support that generalization with about 600 watts x 2 into 2-ohms and a bit over 1.2kW into our 4-ohm reactive load. Signal-to-Noise measured a respectable -97.7 dB, while power on/off noises measured 46.9 dB and 51.6 dB SPL, respectively. Efficiency at 1/3 maximum power measured 32 percent, which certainly isn’t bad for such a large amp. The IFB2340 is definitely capable of major league output, but you had better have lots of current available. Current draw during our maximum output tests was well in excess of 120 amps. CONNECTIONS & ADJUSTMENTS Connections to the IFB2340 consist of 1/2-inch spade receptacles for power and ground, 5/16-inch spade receptacles for speaker connections, and RCA inputs and outputs. Adjustments include input sensitivity with range select, subsonic filter enable (12 dB per octave @ 25 Hz), crossover defeat and cutoff frequency (47 Hz-200 Hz, 12 dB-per-octave), variable bass boost (0 - +12 dB), and bass boost center frequency (25 Hz-80 Hz). INSTALLATION The IFB2340 is a large amp. At just a shade over two feet long, mounting options will be somewhat limited in all but the largest of cars. The amp’s heat sink appears to be from the "thermal mass" school of design with relatively minimal surface area. Amps of this size and class tend to produce a fair amount of heat, so a small fan is probably a good idea. The dual range input sensitivity is a cool idea, although at 0.34 volts to nearly 11 volts, the upper range should handle practically any input source short of another amplifier. The amp’s bass boost circuit seems to behave a bit strangely. With maximum boost at the lowest center frequency, the amp’s overall input sensitivity increases by about 1 dB. While this isn’t all that unusual, the increase in sensitivity of about 5 dB with the center frequency at its maximum setting seems a little odd — I guess you can look at it as if you’re getting something for nothing.